1.67 High-Index Lenses: Thinner, Lighter Lenses For Any Eyeglass Prescription

We recommend the R.I. 1.67 for users who are uncomfortable with thick or heavy high-powered lenses.
The 1.67 with its good tintability is ideal for sunglasses and fashion-oriented glasses.

High-index lenses mean that the lens itself can be both thinner and lighter. This allows your glasses to be as fashionable and comfortable as possible. High-index lenses are particularly beneficial if you have a strong eyeglass prescription for nearsightedness, farsightedness, or astigmatism. However, even those with a low eyeglass prescription can benefit from high index lenses.

Most of the people who wear glasses are nearsighted, which means that the corrective lenses that they wear are thin in the center but thicker at the edge of the lens. The stronger their prescription is, the thicker the edges of their lenses are. This would be fine, except for the fact that rimless frames and many other popular frames can’t accommodate lenses wide enough to accommodate the needs of those who have higher prescriptions, or if they can, the lens edges are visible and can detract from the look of the glasses overall.

High-index lenses solve this problem. Because they have a greater ability to bend light rays, they don’t need to be as thick around the edges to be effective. This makes them the perfect option for people who want a particular style of frames but need to make sure they can still actually see!